Peter O'Toole

Character: Sherlock Holmes (voice)

Ron Haddrick

Character: Dr. Mortimer (voice)

Earle Cross

Character: Dr. Watson (voice)

Helen Morse

Character: Beryl Stapleton (voice)

Robin Stewart

Character: Jack Stapleton (voice)

Moya O'Sullivan

Character: Mrs. Barrymore (voice)

Phillip Hinton

Character: (voice)